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Committee Date Time Place Paper Title / Authors Abstract Paper #
CAS, MSS, IPSJ-AL [detail] 2022-11-17
(Primary: On-site, Secondary: Online)
Evaluation of Theoretical Formula for Inter-band Level Deviation in DAC Bandwidth Tripler
Hayato Ishii (Tokyo Univ. of Science), KeisuKeisuke Kawahara (Yokohama National Univ.), Yohtaro Umeda, koyoya Takano (Tokyo Univ. of Science) CAS2022-40 MSS2022-23
For wider bandwidth of optical transmitter circuit, DAC Bandwidth Tripler that extends the bandwidth of broadband digita... [more] CAS2022-40 MSS2022-23
Ehime The Museum of Art, EHIME
(Primary: On-site, Secondary: Online)
Macromodeling and Verification of Quad-Parallel Bipolar Transistors in the 300 GHz Band
Minami Nasu (Tokyo University of science), Shinsuke Hara, Akifumi Kasamatsu (NICT), Yohtaro Umeda, Kyoya Takano (Tokyo University of science) MW2022-77
The objective of this study is to create a simple four-parallel bipolar transistor model for the 300 GHz band, and we pr... [more] MW2022-77
ED, MW 2022-01-27
Online Online An Inductor-Less Broadband Active Balun with Imbalance Correction and Active Peaking
Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano (TUS) ED2021-62 MW2021-104
This paper presents an area-efficient broadband active balun with low gain error and phase error. An ideal balun has a d... [more] ED2021-62 MW2021-104
MW 2021-12-16
Kanagawa Kawasaki City Industrial Promotion Hall
(Primary: On-site, Secondary: Online)
Analysis and Design of a Differential Distributed Amplifier with Coupled Inductors
Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano (TUS), Shinsuke Hara (NICT) MW2021-92
This paper presents a differential distributed amplifier with coupled inductors. Broadband and multi-level signaling are... [more] MW2021-92
MW 2021-05-20
Online Online A Trial Manufacture of an Area-Efficient Distributed Amplifier Using Pseudo-Fractal Bended Transmission Lines
Keisuke Kawahara, Yohtaro Umeda, Kyoya Takano (TUS), Shinsuke Hara (NICT) MW2021-9
In recent years, communication traffic has been increasing. Distributed amplifiers have been reported to a bandwidth of ... [more] MW2021-9
MW, ED 2021-01-29
Online Online A study on precise extraction of parasitic resistances in InGaAs HEMTs
Keigo Yaguchi (Tokyo Univ. of Science), Tomotaka Hosotani (Tohoku Univ.), Yohtaro Umeda, Kyoya Takano (Tokyo Univ. of Science), Tetsuya Suemitsu, Akira Satou (Tohoku Univ.) ED2020-35 MW2020-88
In this paper, we propose a new method to extract the parasitic resistances of high electron mobility transistor (HEMT) ... [more] ED2020-35 MW2020-88
- 2020-05-15
Overseas CU, Bangkok, Thailand
Design of a 135GHz Marchand Balun in 40nm CMOS Technology
Hajime Sakai, Kyoya Takano, Yohtaro Umeda (Tokyo Univ. of Science)
The use of the D band (110-170 GHz) as the intermediate frequency band (IF band) of the 300 GHz band CMOS wireless commu... [more]
- 2020-05-15
Overseas CU, Bangkok, Thailand
A 135GHz Frequency Tripler in 40 nm CMOS Technology
Koki Sekine, Kyoya Takano, Yohtaro Umeda (Tokyo Univ. of Science)
With the spread of IoT, high-speed and large-capacity wireless communication has been demanded. Therefore, the IEEE Std ... [more]
- 2020-05-15
Overseas CU, Bangkok, Thailand
Design of 45GHz Frequency Trippler in 40nm CMOS Technology
Kenta Sahara, Kyoya Takano, Yohtaro Umeda (Tokyo Univ. of Science)
As a circuit constituting a wireless communication device, a frequency tripler plays an important role as a circuit for ... [more]
ICD, CPSY, CAS 2018-12-21
Okinawa   Power-amplifier-inserted Transversal Filter that Recovers Quantization Noise Power by CMOS Rectifier
Yuto Tanaka, Yohtaro Umeda, Kyoya Takano (Tokyo University of Science) CAS2018-78 ICD2018-62 CPSY2018-44
In this paper, we aim to improve power efficiency by using a CMOS rectifier for power-amplifier-inserted transversal fil... [more] CAS2018-78 ICD2018-62 CPSY2018-44
WBS, ITS, RCC 2018-12-06
Okinawa Miyako Island Hirara Port Terminal Bldg. [Poster Presentation] A Study on Underwater Visible Light Simultaneous Wireless Information and Power Transfer System using Inverse Pulse Position Modulation
Ryota Kimoto (TUS), Yusuke Kozawa (Ibaraki Univ.), Yohtaro Umeda (TUS), Hiromasa Habuchi (Ibaraki Univ.) WBS2018-32 ITS2018-15 RCC2018-63
In this paper, for constructing flexible underwater wireless network, we discussed visible light simultaneous wireless i... [more] WBS2018-32 ITS2018-15 RCC2018-63
ICD, CPSY, CAS 2017-12-14
Okinawa Art Hotel Ishigakijima A Study on Wireless Transmitter with Up-converted Root-Cosine Roll-off Waveform
Iroi Yamamoto, Yohtaro Umeda (Tokyo Univ. of Science) CAS2017-67 ICD2017-55 CPSY2017-64
In this paper, we reconfigure the conventional analog signal processing transmitter and propose an all-digital transmitt... [more] CAS2017-67 ICD2017-55 CPSY2017-64
MW, EMCJ, EST, IEE-EMC [detail] 2017-10-19
Akita Yupopo Comparison of Power Combining Methods in Power-amplifier-inserted Transversal Filter for EPWM Transmitters
Yuto Tanaka, Yohtaro Umeda (TUS), Yusuke Kozawa (Ibaraki Univ.) EMCJ2017-32 MW2017-84 EST2017-47
This paper compares power-amplifier-inserted transversal filter (PAITF) with 180º hybrids and T-junctions for envelope p... [more] EMCJ2017-32 MW2017-84 EST2017-47
MW, EMCJ, EST, IEE-EMC [detail] 2017-10-20
Akita Yupopo A Quadrature-modulation EPWM Transmitter That Uses Co-phase Sine Wave Carriers for I/Q Channel and a 90° Hybrid as a Signal Combiner
Tomoaki Morita, Ryo Sakai, Yohtaro Umeda (Tokyo Univ. of Science), Yusuke Kozawa (Ibaraki Univ.) EMCJ2017-45 MW2017-97 EST2017-60
Quadrature-modulation (QM) envelope-pulse-width modulation (EPWM) transmitter with a 180° hybrid as a power combiner has... [more] EMCJ2017-45 MW2017-97 EST2017-60
MW, EMCJ, EST, IEE-EMC [detail] 2017-10-20
Akita Yupopo A Simple Design of 2.45GHz Class-F Time-Reversal Rectifier Using Linear Theory
Fuminori Myojin, Yohtaro Umeda (TUS) EMCJ2017-46 MW2017-98 EST2017-61
In this paper, a theoretical design of class-F time-reversal rectifier is proposed. By considering phase and amplitude o... [more] EMCJ2017-46 MW2017-98 EST2017-61
WBS 2017-10-12
Wakayama Rivage Spa Hikigawa (Nanki Shirahama) [Poster Presentation] Experimental Evaluation of PWM/DPAM Hybrid Dimming Control Method for DCSK
Yusuke Matsuda (TUS), Yusuke Kozawa (Ibaraki Univ.), Yohtaro Umeda (TUS) WBS2017-27
Digital color shift keying (DCSK) is a visible light communication (VLC) intensity modulation method, which can fulfill ... [more] WBS2017-27
SDM, ICD, ITE-IST [detail] 2017-08-02
Hokkaido Hokkaido-Univ. Multimedia Education Bldg. Multi-carrier Transmission Characteristics of All-Digital Low-IF Transmitter Using Weber-Type Image Suppression Method
Takumi Kamo, Yohtaro Umeda (Tokyo Univ. of Science), Yusuke Kozawa (Ibaraki Univ.) SDM2017-47 ICD2017-35
In this paper, multicarrier transmission is performed by using a bandpass type (BP) ΔΣ modulator in an orthogonal modula... [more] SDM2017-47 ICD2017-35
SDM, ICD, ITE-IST [detail] 2017-08-02
Hokkaido Hokkaido-Univ. Multimedia Education Bldg. A Quadrature-modulation EPWM Transmitter with Parallel-Output MASH Delta-Sigma Modulator
Takumi Yamamoto, Yohtaro Umeda (Tokyo Univ. of Science), Yusuke Kozawa (Ibaraki Univ.) SDM2017-48 ICD2017-36
In this paper, Multi StAge Noise Shaping (MASH) architecture is employed to realize high noise reduction capability by n... [more] SDM2017-48 ICD2017-36
WBS, MICT 2017-07-13
Shizuoka ACT CITY [Poster Presentation] A Fundamental Study on DC/AC Separation Filter Design for Underwater Visible Light Communication System with Simultaneous Power Transfer
Ryota Kimoto (TUS), Yusuke Kozawa (Ibaraki Univ.), Yohtaro Umeda (TUS), Hiromasa Habuchi (Ibaraki Univ.) WBS2017-10 MICT2017-12
In this study, for constructing flexible underwater wireless sensor network, we discussed underwater visible light commu... [more] WBS2017-10 MICT2017-12
MW, ICD 2017-03-03
Okayama Okayama Prefectural Univ. Quadrature-modulation Envelope-pulse-width-modulation Transmission System Using Quadrature Polarized Waves
Ryo Sakai, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Science) MW2016-204 ICD2016-134
This paper presents quantitative evaluation of power efficiency decrese by not satisfying the zero current switching (ZC... [more] MW2016-204 ICD2016-134
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